Asymmetric synthesis of new chiral N-sulfinyl 2,2-disubstituted aziridines by Grignard additions across α-chloro N-sulfinyl ketimines
作者:Filip Colpaert、Sven Mangelinckx、Erika Leemans、Bram Denolf、Norbert De Kimpe
DOI:10.1039/c001471k
日期:——
Reaction of chiral α-chloro N-tert-butanesulfinyl ketimines with Grignard reagents afforded new chiral N-sulfinyl 2,2-disubstituted aziridines in good to excellent diastereomeric ratio (dr up to 98â:â2). The 1,2,2-trisubstituted aziridines were isolated in high overall yield (51â85%) and with excellent enantiomeric excess (>98% ee). The stereoselectivity obtained in the Grignard addition is rationalized by the coordinating ability of the α-chloro atom resulting in the opposite stereochemical outcome as observed for nonfunctionalized N-sulfinyl ketimines.